It's alive, it's alive... (thanks linw for advice)
After a night of charging, the voltage is at 3.63V.
I think it was just a matter of great discharge. At the moment the entered the tablet for continue to charge normally.
Probably was the result of not following my own advice and leave in the 1-2% charge.
It is best to leave it at 10-15% to ensure proper voltage.
PD: The charger I use is very slow for a 3000mA battery, but it's better to use a fast charger, and the latter, either in reality, the end of the full charge the battery can overheat, reducing its lifetime.